The 14-digit number is used for which item?

• A. Supply document number
• B. Borescope serial number
• C. Aircraft registration
• D. Part serial number

Answer: (A)

The number of fourteen digits is used to identify supply documents. In aviation logistics, supply documents such as purchase orders and receiving reports need a single, unique reference that can be printed, scanned, and referenced across the parts system. A purely numeric fourteen-digit format provides enough room to encode year, department, and a running sequence, while keeping the reference simple for data processing and audit trails. This helps ensure precise traceability of parts and materials through procurement, storage, and inventory control. Other items use different formats: borescope serial numbers are tied to the device and can be shorter or include letters; aircraft registration is an alphanumeric tail number assigned by authorities; part serial numbers are specific to each part and also vary in length and composition. So the fourteen-digit number best fits the needs of supply document tracking.